IAm_Not_Lost
New Member
I’ve had the EG4 280ah Wall Mount batteries for about six months now and they’ve worked well, but over the last week I’ve noticed one of the cells in one of my three batteries isn’t reaching full charge voltage and seems to hang a bit lower than the other cells at float voltage.
My system uses Midnite Classics for charging. Absorb voltage is set at 56.2 per the EG4 manual, and absorb time is set for 15 minutes (at the recommendation of Midnite Solar).
The EG4 BMS only appears to keep the batteries at around 56 volts during absorb for approx 8-10 minutes before it begins lessening the charge, which is before the Midnite Classis has stopped its absorb charge, so it seems like the 15 minute time is adequate.
For a week now, cell “15” will reach about 3.370 volts during charging, but generally won’t go above that. Once the charge resorts to float (set at 54 volts), it will hang around 3.340, while the other cells are around 3.37. Once the batteries have discharged some in the evening and sunset has occurred the cells will begin dropping a bit, and by around 3.310 volts all the cells will be about the same. In the morning cell “15” isn’t generally lower than the others.
My batteries generally get discharged to about 60-70% since it isn’t really too hot or cold right now. Come mid summer I expect a 40-50% depth of discharge. Currently they are hitting absorb by the afternoon and float until evening.
Anyone with insights on my next steps, or is this normal behavior and it takes a few cycles to correct itself? I am new to lithiums in this context, and how their BMS’s are programmed to operate.
Appreciate the help!
My system uses Midnite Classics for charging. Absorb voltage is set at 56.2 per the EG4 manual, and absorb time is set for 15 minutes (at the recommendation of Midnite Solar).
The EG4 BMS only appears to keep the batteries at around 56 volts during absorb for approx 8-10 minutes before it begins lessening the charge, which is before the Midnite Classis has stopped its absorb charge, so it seems like the 15 minute time is adequate.
For a week now, cell “15” will reach about 3.370 volts during charging, but generally won’t go above that. Once the charge resorts to float (set at 54 volts), it will hang around 3.340, while the other cells are around 3.37. Once the batteries have discharged some in the evening and sunset has occurred the cells will begin dropping a bit, and by around 3.310 volts all the cells will be about the same. In the morning cell “15” isn’t generally lower than the others.
My batteries generally get discharged to about 60-70% since it isn’t really too hot or cold right now. Come mid summer I expect a 40-50% depth of discharge. Currently they are hitting absorb by the afternoon and float until evening.
Anyone with insights on my next steps, or is this normal behavior and it takes a few cycles to correct itself? I am new to lithiums in this context, and how their BMS’s are programmed to operate.
Appreciate the help!
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